Packaging machine system with a multi-stage valve actuator for filling products into a container

ABSTRACT

A fill system for use in a packaging machine is disclosed for filling a container with a primary and a secondary product. The fill system includes a primary pump system for pumping a predetermined amount of the primary product received at an inlet thereof. A primary fill pipe having an outlet overlying a container processing path along which the containers are filled and sealed by the packaging machine is connected to receive the predetermined amount of primary product from the outlet of the primary pump system. The fill system further includes a secondary pump system for pumping a predetermined amount of the secondary product received at an inlet thereof to an outlet thereof. A secondary fill pipe is connected to receive the predetermined amount of secondary product from the outlet of the secondary pump means. A valve mechanism is disposed, for example, concentrically within the secondary fill pipe and includes a sealing member positioned at the outlet of the secondary fill pipe. The valve mechanism is driven by a linear multi-stage actuator to provide multiple selected valve opening widths.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims benefit of priority of provisional application,Ser. No. 60/018,663, filed May 30, 1996.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable.

BACKGROUND OF THE INVENTION

The present invention relates to a filling system for use in a packagingmachine. More particularly, the present invention relates to a fillingsystem which utilizes a multi-stage linear valve actuator to provide fordifferent filling rates and volumes.

In the past, packaging machine systems have been proposed, such asdisclosed in International Publication Number WO 96/09957, entitled"Packaging Machine System for Filling Primary and Secondary ProductsInto A Container," published Apr. 4, 1996. The '957 InternationalPublication claims priority from a U.S. patent application, Ser. No.08/315,246, filed Sep. 29, 1994 now, U.S. Pat. No. 5,687,779.International Publication No. WO 96/09957 and U.S. Pat. No. 5,687,779are expressly incorporated herein by reference in their entireties.

A need remains within the industry for an improved product fillingmechanism which has enhanced filling accuracy and which is able to fillcontainers of differing volume sizes.

BRIEF SUMMARY OF THE INVENTION

It is an advantage of the present invention to provide a multi-stepsecondary outlet valve assembly to improve filling accuracy forcontainers of differing volumes.

It is a further advantage of the present invention to provide amulti-step secondary outlet valve assembly which provides an evenfilling profile.

It is yet a further advantage of the present invention to provide amulti-step secondary outlet valve assembly which affords better accuracywhen combining two products, such as cream and skim milk, therebyaffording a better end product.

These and other advantages of the invention are achieved in a packagingmachine for filling a container with a primary product and a secondaryproduct comprising a primary fill pipe having an interior extending toan outlet. The machine also has a secondary fill pipe arranged withinthe interior of the primary fill pipe. The secondary fill pipe has anopening near the outlet of the primary fill pipe. A multi-stage valve isarranged at the opening of the secondary fill pipe, and a linear valveactuator is operatively connected to the valve to open the valve inmultiple discrete stages with respect to the opening of the secondaryfill pipe, thereby controlling secondary product flow therethrough.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

FIG. 1 illustrates a perspective view of a filling mechanism accordingto the present invention;

FIG. 2 illustrates a perspective exploded view of a filling mechanismaccording to the present invention;

FIG. 3 illustrates a side sectional view of a filling mechanismaccording to the present invention taken along line 3--3 in FIG. 1;

FIG. 4A illustrates a side sectional view of an upper most portion ofthe filling mechanism of FIG. 3;

FIG. 4B illustrates a side sectional view of an intermediate section ofthe filling mechanism of FIG. 3;

FIG. 4C illustrates a side sectional view of a lower end portion of thefilling mechanism of FIG. 3 when in a closed position;

FIG. 5 illustrates a side sectional view of the lower end portion of thefilling mechanism of FIG. 3 when opened to a first step or stage; and

FIG. 6 illustrates a side sectional view of the lower end portion of thefilling mechanism of FIG. 3 when opened to a second step or stage.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 3 generally illustrates a filling mechanism (denoted by thereference numeral 2) according to a preferred embodiment of the presentinvention. The general structure of the filling mechanism 2 is set forthand described in the above referenced co-pending U.S. application (Ser.No. 08/315,246, filed Sep. 29, 1994) and International Publication (WO96/09957, published Apr. 4, 1996). Since the '246 U.S. Application and'957 International Publication have been incorporated by reference, thedetails of the filling mechanism are not described hereafter.

Generally, the filling mechanism includes an inlet 4 for secondaryproduct which communicates with a fill pipe 6. The fill pipe 6 has anopen lower end 8 (FIG. 4C). The fill pipe 6 receives a stem 10 along itsinterior. The upper end of the stem 10 is securely engaged by a linearvalve actuator (generally denoted by reference 12 in FIG. 3). The stem10 is driven linearly and reciprocally along its longitudinal axis bythe actuator 12. The linear actuator 12 may be one of several knownconstructions, such as a mechanically driven actuator, pneumaticallydriven actuator, hydraulically driven actuator and the like. In thepreferred embodiment, the actuator is hydraulically driven. The linearvalve actuator 12 may be extended to multiple discrete steps or stages.For instance, the linear valve actuator 12 may represent atwo-step/stage actuator which is drivable between a retracted position,a first extended position and a second extended position.

Optionally, the actuator 12 may include more than two steps or stages,depending on the needs of the filling mechanism.

FIG. 4C illustrates a lower end portion of the filling mechanism 2,while the actuator 12 is retracted, whereby the stem 10 sealably closesthe open end 8 with the valve 18.

FIG. 5 illustrates the lower end portion of the filling mechanism 2,while the linear actuator 12 is extended to the first step or stage.When extended to the first step, the actuator 12 drives the stem 10downward by a first distance or valve stroke to a first position. Whenat the first extended position, an opening 16 is provided between thevalve 18 and the lower end 8 of the fill pipe 6. The width of theopening 16 is denoted D₁.

FIG. 6 illustrate the lowered portion of the filling mechanism 2 whilethe actuator 12 is extended to the second step or stage. When extendedto the second step or stage, the actuator 12 drives the stem 10 downwardto a second extended position. When at the second step, the opening 16is widened to a width denoted D₂ filling nozzle 20 is shown at thebottom of the filling mechanism 2 in FIGS. 4C, 5 and 6.

As explained above, the linear actuator 12 may include more than twosteps and thus the opening 16 may be discretely varied by distancesother than D₁ and D₂. The gap widths D₁ and D₂ may vary depending uponthe particular application. By way of example only, the width D₁ mayequal 4 mm while the width D₂ may equal 10 mm.

By utilizing a linear actuator 12 which is extendable to multiple steps,the preferred embodiment of the present invention provides more accuracywhen filling containers of differing volumes, thereby providing a moreeven filling profile.

While particular elements, embodiments and applications of the presentinvention have been shown and described, it will be understood, ofcourse, that the invention is not limited thereto since modificationsmay be made by those skilled in the art, particularly in light of theforegoing teachings. It is, therefore, contemplated by the appendedclaims to cover such modifications as incorporate those features whichcome within the spirit and scope of the invention.

What is claimed is:
 1. A fill system in a packaging machine for fillinga series of containers with a primary product and a secondary product,the fill system comprising:a primary fill pipe in flow communicationwith a primary product, the primary fill pipe, openable to allow theprimary product and secondary product to discharge from the fill system;having an outlet overlying a container processing path along which eachof the series of containers are filled and sealed on the packagingmachine; a nozzle connected at the outlet of the primary fill pipe; asecondary fill pipe in flow communication with a secondary product, thesecondary fill pipe being concentrically disposed within the primaryfill pipe and having an outlet overlying the outlet of the primary fillpipe; a multi-stage valve arranged at the outlet of the secondary fillpipe, the multi-stage valve operating between an opened position and asealed position, the multi-stage valve having a diameter greater than adiameter of the outlet of the secondary fill pipe and lesser than adiameter of the outlet of the primary fill pipe; and a linear valveactuator operatively connected to the multi-stage valve to open themulti-stage valve in multiple discrete stages with respect to the outletof the secondary fill pipe, the linear valve actuator connected to thevalve by a stem disposed within the secondary fill pipe; whereby theflow of the secondary product through the outlet of the secondary fillpipe may be controlled by extension or retraction of the multi-stagevalve between the opened and sealed positions and secondary productmixes with the primary product prior to flowing through the nozzle.